Summary It is designed to fit with 1/4 smooth or threaded rods. But actually I had to enlarge the holes with a drill! The best thing is that you can cut the rod the length you need. Probably that 6mm rods will fit as well... even better as they are 0,35mm smaller! It was designed to be fixed with 2 screws, but only one is solid enough for me. I used #6 5/8 screws witch can be found in any hardware store. It can fit under a bar, under kitchen cabinets etc. You have to adjust the width between them using your wine glass. It has to be as tight possible to let de glass foot go between the 2 printed parts. Hope you'll take some pictures and publish "make"